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Characteristics of seawater desalination pretreatment filter


Seawater cannot be used directly because of its high salt content. At present, two methods are mainly used to desalinate seawater, namely distillation and reverse osmosis.

Distillation method is mainly used in super large seawater desalination treatment and places rich in heat energy. Reverse osmosis membrane method is widely used because of its wide application and high desalination rate.

The water quality after desalination is even better than tap water, so it can be used by industry, commerce, residents, ships and ships.

In the field of seawater desalination, pretreatment is the key to ensure the long-term stable operation of reverse osmosis system. Reverse osmosis system needs better pretreatment to reduce seawater turbidity and prevent the growth of bacteria, algae and other microorganisms, so as to ensure the effluent quality. If the inlet water quality is poor, the water production rate is very low. Therefore, seawater must be pretreated and filtered before entering the reverse osmosis membrane unit.

Full automatic high-pressure backwashing without manual intervention; No dead angle during flushing; Filtering accuracy: 2um-200um; The filter screen does not need to be replaced and is used for life, and a new seawater resistant filter screen is developed for seawater desalination pretreatment.

The details are as follows:

Product related categories: water purification equipment, water filtration equipment, water treatment equipment, self-cleaning filter, full-automatic backwash filter, differential pressure filter, water filter, high-precision filter, seawater desalination pretreatment filter.

It can be used as a substitute for multi-media filter, disc filter, sand filter and sand filter.

Technical features

  • High filtration precision and stable effluent quality.
  • Automatic backwashing is realized through its own retrieval and response functions, which can deal with unstable water quality fluctuations without manual intervention.
  • The control system of seawater desalination pretreatment filter has sensitive response and accurate operation. It has the dual setting function of differential pressure and time. It can flexibly adjust the backwashing differential pressure or time setting value according to different water sources and filtration accuracy.
  • The cleaning is efficient and thorough, and the filter screen can be completely restored to the initial state, so it can be used for life without replacement.
  • During backwashing, normal water production is not interrupted, continuous operation, stable and reliable.
  • The backwashing duration is short, and the backwashing water consumption is only 0.001 ~ 0.002% of the normal water production, saving water, power and energy.
  • Compact and reasonable structural design, small floor area, flexible and convenient installation and movement.
  • The equipment has few vulnerable parts, no consumables, low operation and maintenance cost and simple operation and management.
  • It has a wide range of applications and can be applicable to different raw water quality and water requirements.

Technological innovation

  • The seawater desalination pretreatment filter adopts seawater resistant sintered filter screen for the first time, with high strength, high precision and corrosion resistance, and the maximum filtration accuracy can reach 2 microns.
  • The patented internal mechanical structure is adopted to realize the real high-pressure backwashing function. The combination of external high-pressure backwashing and internal self-priming blowdown of the filter screen can easily and completely remove the impurities intercepted by the filter screen, with no dead angle and flux attenuation, ensuring the filtration efficiency and long service life.
  • The cleaning differential pressure signal is transmitted by pressure transmitter, and the signal detection and transmission is more accurate.
  • The transmission device is built-in, sealed and isolated from the overcurrent parts, and is designed with tripping protection function to prevent damage to the motor or body parts, and the operation is stable and reliable.
  • The sewage outlet depends on hydraulic sealing, without solenoid valve or other vulnerable seals, which is simple and practical.
  • The inlet and outlet flange is designed as a movable structure, which can rotate freely to adjust the screw hole direction, which is convenient for on-site installation.
  • The internal anti-corrosion adopts special non-toxic anti-corrosion materials, which have good weather resistance, acid and alkali resistance, salt spray resistance, mildew resistance and other properties.